T-square



UNITED STATES PATENT OFFICE.

JOSEPH W. ROWE, OF AUSTIN, TEXAS.

T-SQUARE.

SPECIFICATION forming part of Letters Patent No. 267,260, dated November '7, 1882.

Application filed April 21, 1882.

To all whom it may concern Be it known that I, J OSEPH WILLIAM ROWE, of Austin, in the county of Travis and State of Texas, have invented a new and Improved TSquare, of which the following is a full, clear, and exact description.

Thisinvention consists of the tongue or shaft of the T-square, made of an equilateral scale, and fitted in the head so that it can be readily taken out and shifted around on its longitudi-' nal axis from side to side, in order that the different scales of the different sides may be set to the work, so that the draftsman can set his points directly therefrom without the use of thedividers, as will be hereinafter described.

Reference is to be had to the accompanying drawings, forming part of this specification, in which similar letters-of reference indicatecorresponding parts in all the figures.

Figure l is a side elevation of my improved T-square. Fig. 2 is a side elevation of the head of the square, and Fig. 3 is an end elevation of the scale to be employed for the tongue of the square.

A represents the tongue ofthe square, which I propose to make in the form ofthe common equilateral triangular scale, with the usual or any desired scales printed on the square; and B represents the head of the square, in which I propose to tit the tongue by an equilateral mortise through said head, corresponding to the form of the tongue, and also by the brackets (J on the back, so that the tongue can be readily taken out and shifted around from side to side to present the different scales to the work on the paper for taking the measures diiectly from the scale without the use of the dividers.

(No model.)

D is a binding-screw by which to fasten the tongue in the head B, and E is a rabbet which I make in the head to fit the edge of the board, for keeping the tongue upright, said tongue being too narrow to control the head.

The scales may be printed any desired length.

fitted adjustablyin the head of the square,

substantially as described.

2. The combination of the tongue A, constructed in the form of an equilateral scale, the head B, having a mortise corresponding to the form of the tongue, and the binding-screw D, substantially as specified.

3. The combination of the tongue A, constructed in the form of an equilateral scale, the head B, having a mortise corresponding to the form of the tongue, binding-screw D, and the brackets G, substantially as described.

4. The combination of the tongue A, constructed in the form of an equilateral scale, and the headB, having the rabbet E, substantially as specified.

JosEPH WILLIAM ROWE.

Witnesses:

l. G. TAYLOR, JOHN B. BRADFORD. 

